How to fetch Java version using single line command in Linux

Question

I want to fetch the Java version in Linux in a single command    I am new to awk so I am trying something like   java -version awk   print 3       But that does not return the version   How would I fetch the 1 6 0 21 from the below Java version output   java version  1 6 0 21  Java TM  SE Runtime Environment  build 1 6 0 21-b06  Java HotSpot TM  64-Bit Server VM  build 17 0-b16  mixed mode

User · Answer

Since  at least on my linux system  the version string looks like  1 8 0 45        bin bash  function checkJavaVers       for token in   java -version 2 gt  amp 1      do         if     token          digit          digit                        then             export JAVA MAJOR   BASH REMATCH 1               export JAVA MINOR   BASH REMATCH 2               export JAVA BUILD   BASH REMATCH 3               return 0         fi     done     return 1     test checkJavaVers      echo  check failed    exit    echo   JAVA MAJOR  JAVA MINOR  JAVA BUILD

User · Answer

This way works for me     java -version 2 gt  amp 1 awk   version   gsub            print  NF    1 8 0 171

User · Answer

Getting only the  major  build     java -version 2 gt  amp 1   head -n 1   awk -F          print  3

User · Answer

I d suggest using grep -i version to make sure you get the right line containing the version string   If you have the environment variable JAVA OPTIONS set  openjdk will print the java options before printing the version information   This version returns 1 6  1 7 etc   java -version 2 gt  amp 1   grep -i version   cut -d    -f2   cut -d    -f1-2

User · Answer

Redirect stderr to stdout   Get first line  Filter the version number   java -version 2 gt  amp 1   head -n 1   awk -F       print  2

User · Answer

This is a slight variation  but PJW s solution didn t quite work for me   java -version 2 gt  amp 1   head -n 1   cut -d    -f2   just cut the string on the delimiter    double quotes  and get the second field

User · Answer

You can use --version and in that case it s not required to redirect to stdout  java --version   head -1   cut -f2 -d      From java help  -version      print product version to the error stream and exit --version     print product version to the output stream and exit

[linux] How to fetch Java version using single line command in Linux

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